Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 374,500	$ 340,580	$ 116,641
Other comprehensive (loss) income:
Foreign currency translation adjustment, net of tax	(42,337)	(244,506)	362,834
Unrealized gain on cash flow hedges, net of tax	15	0	0
Other comprehensive (loss) income, net of tax	(42,322)	(244,506)	362,834
Total comprehensive income (loss)	$ 332,178	$ 96,074	$ 479,475